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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of revenue from contracts with customers [Abstract] |
Disaggregation Of Revenue | The majority of the Corporation's revenues are derived from the sale of physical power, capacity and environmental attributes, leasing of power facilities, and from asset optimization activities, which the Corporation disaggregates into the following groups for the purpose of determining how economic factors affect the recognition of revenue.
Year ended Dec. 31, 2020 | Hydro | Wind and Solar | North American Gas(1) | Australian Gas | Alberta Thermal(2) | Centralia(2) | Energy Marketing | Corporate and Other | Total
Revenues from contracts with customers | 141 |  | 261 |  | 196 |  | 90 |  | 325 |  | 10 |  | — |  | — |  | 1,023 |
Revenue from leases(3) | — |  | — |  | 8 |  | 60 |  | 55 |  | — |  | — |  | — |  | 123 |
Revenue from derivatives and other trading activities | — |  | (2) |  | 4 |  | — |  | (12) |  | 283 |  | 122 |  | 12 |  | 407 |
Government incentives | 1 |  | 4 |  | — |  | — |  | — |  | — |  | — |  | — |  | 5 |
Revenue from other(4) | 10 |  | 66 |  | 9 |  | 8 |  | 251 |  | 204 |  | — |  | (5) |  | 543 |
Total revenue | 152 |  | 329 |  | 217 |  | 158 |  | 619 |  | 497 |  | 122 |  | 7 |  | 2,101 |
Revenues from contracts with customers |  |  |  |  |  |  |
Timing of revenue recognition |  |  |  |  |  |  |  |  |
At a point in time | — |  | 25 |  | — |  | — |  | 23 |  | 10 |  | — |  | — |  | 58 |
Over time | 141 |  | 236 |  | 196 |  | 90 |  | 302 |  | — |  | — |  | — |  | 965 |
Total revenue from contracts with customers | 141 |  | 261 |  | 196 |  | 90 |  | 325 |  | 10 |  | — |  | — |  | 1,023 |
(1) This segment was previously known as the Canadian Gas segment but renamed with the acquisition of the US cogeneration facility in the second quarter of 2020. Refer to Note 4(K) for further details. In addition, during the third quarter of 2020, merchant revenue within this segment was reclassified from revenue from contracts with customers to revenue from other and prior periods were adjusted. (2) The Canadian Coal segment was renamed Alberta Thermal and the US Coal segment was renamed Centralia in the third quarter of 2020. (3) Total rental income, including contingent rent related to certain PPAs and other long-term contracts that meet the criteria of operating leases. (4) Includes merchant revenue and other miscellaneous.
Year ended Dec. 31, 2019 | Hydro | Wind and Solar | North American Gas(1) | Australian Gas | Alberta Thermal(2) | Centralia(2) | Energy Marketing | Corporate and Other | Total
Revenues from contracts with customers | 142 |  | 244 |  | 190 |  | 87 |  | 395 |  | 10 |  | — |  | — |  | 1,068 |
Revenue from leases(3) | — |  | — |  | — |  | 65 |  | 65 |  | — |  | — |  | — |  | 130 |
Revenue from derivatives and other trading activities | — |  | 18 |  | 2 |  | — |  | (17) |  | 160 |  | 129 |  | 4 |  | 296 |
Government incentives | — |  | 8 |  | — |  | — |  | — |  | — |  | — |  | — |  | 8 |
Revenue from other(4) | 14 |  | 42 |  | 17 |  | 8 |  | 373 |  | 401 |  | — |  | (10) |  | 845 |
Total revenue | 156 |  | 312 |  | 209 |  | 160 |  | 816 |  | 571 |  | 129 |  | (6) |  | 2,347 |
Revenues from contracts with customers |  |  |  |  |  |  |
Timing of revenue recognition |  |  |  |  |  |  |  |  |
At a point in time | — |  | 27 |  | — |  | — |  | 41 |  | 10 |  | — |  | — |  | 78 |
Over time | 142 |  | 217 |  | 190 |  | 87 |  | 354 |  | — |  | — |  | — |  | 990 |
Total revenue from contracts with customers | 142 |  | 244 |  | 190 |  | 87 |  | 395 |  | 10 |  | — |  | — |  | 1,068 |
(1) This segment was previously known as the Canadian Gas segment but renamed with the acquisition of the US cogeneration facility in the second quarter of 2020. Refer to Note 4(K) for further details. In addition, during the third quarter of 2020, merchant revenue within this segment was reclassified from revenue from contracts with customers to revenue from other and prior periods were adjusted. (2) The Canadian Coal segment was renamed Alberta Thermal and the US Coal segment was renamed Centralia in the third quarter of 2020. (3) Total rental income, including contingent rent related to certain PPAs and other long-term contracts that meet the criteria of operating leases. (4) Includes merchant revenue and other miscellaneous.
Year ended Dec. 31, 2018 | Hydro | Wind and Solar | North American Gas(1) | Australian Gas | Alberta Thermal(2) | Centralia(2) | Energy Marketing | Corporate | Total
Revenues from contracts with customers | 132 |  | 206 |  | 206 |  | 91 |  | 517 |  | 9 |  | — |  | — |  | 1,161 |
Revenue from leases(3) | 7 |  | 27 |  | — |  | 68 |  | 68 |  | — |  | — |  | — |  | 170 |
Revenue from derivatives and other trading activities | — |  | (20) |  | 4 |  | — |  | (1) |  | 115 |  | 67 |  | — |  | 165 |
Government incentives | — |  | 16 |  | — |  | — |  | — |  | — |  | — |  | — |  | 16 |
Revenue from other(4) | 17 |  | 53 |  | 22 |  | 6 |  | 328 |  | 318 |  | — |  | (7) |  | 737 |
Total revenue | 156 |  | 282 |  | 232 |  | 165 |  | 912 |  | 442 |  | 67 |  | (7) |  | 2,249 |
Revenues from contracts with customers |  |  |  |  |  |  |
Timing of revenue recognition |  |  |  |  |  |  |  |  |
At a point in time | — |  | 18 |  | — |  | — |  | 38 |  | 9 |  | — |  | — |  | 65 |
Over time | 132 |  | 188 |  | 206 |  | 91 |  | 479 |  | — |  | — |  | — |  | 1,096 |
Total revenue from contracts with customers | 132 |  | 206 |  | 206 |  | 91 |  | 517 |  | 9 |  | — |  | — |  | 1,161 |
(1) This segment was previously known as the Canadian Gas segment but renamed with the acquisition of the US cogeneration facility in the second quarter of 2020. Refer to Note 4(K) for further details. In addition, during the third quarter of 2020, merchant revenue within this segment was reclassified from revenue from contracts with customers to revenue from other and prior periods were adjusted. (2) The Canadian Coal segment was renamed Alberta Thermal and the US Coal segment was renamed Centralia in the third quarter of 2020. (3) Total rental income, including contingent rent related to certain PPAs and other long-term contracts that meet the criteria of operating leases. (4) Includes merchant revenue and other miscellaneous.
Changes In Contract Liabilities | The Corporation has recognized the following revenue-related contract liabilities:
Contract liabilities | 2020 | 2019
Balance, beginning of the year | 15 |  | 88 |
IFRS 16 transition adjustments(1) | — |  | 15 |
Amounts transferred to revenue included in opening balance | (1) |  | (10) |
Consideration received | 1 |  | 5 |
Increases due to interest accrued and expensed during the period | — |  | 5 |
Contract termination associated with the purchase of Keephills 3 (Note 4(R)) | — |  | (88) |
Consideration paid | 2 |  | — |
Performance obligations satisfied | (2) |  | — |
Balance, end of year | 15 |  | 15 |
Current portion | 1 |  | 1 |
Long-term portion | 14 |  | 14 |
(1) In 2019, on transition to IFRS 16, some contracts that were previously considered leases under IAS 17 did not meet the definition of a lease under IFRS 16 and therefore were assessed under IFRS 15 and balances were transferred from deferred revenue to contract liabilities.

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